staging: vt6656: fix sign of rx_dbm to bb_pre_ed_rssi.

bb_pre_ed_rssi is an u8 rx_dm always returns negative signed
values add minus operator to always yield positive.

fixes issue where rx sensitivity is always set to maximum because
the unsigned numbers were always greater then 100.

Fixes: 63b9907f58f1 ("staging: vt6656: mac80211 conversion: create rx function.")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/aceac98c-6e69-3ce1-dfec-2bf27b980221@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vt6656/dpc.c b/drivers/staging/vt6656/dpc.c
index 821aae8ca402fa3cac7ed2bca2f93fc3cdd62961..a0b60e7d1086731c6647777f493d9dc43fb6bfb1 100644 (file)
--- a/drivers/staging/vt6656/dpc.c
+++ b/drivers/staging/vt6656/dpc.c
@@ -98,7 +98,7 @@ int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb,
 
        vnt_rf_rssi_to_dbm(priv, tail->rssi, &rx_dbm);
 
-       priv->bb_pre_ed_rssi = (u8)rx_dbm + 1;
+       priv->bb_pre_ed_rssi = (u8)-rx_dbm + 1;
        priv->current_rssi = priv->bb_pre_ed_rssi;
 
        skb_pull(skb, sizeof(*head));